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For explanation

http://www.isi.edu/nsnam/ns/doc/node216.html

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Posted by Hash007

It is an empirical mathematical formulation for the characterization of radio wave propagation as a function of frequency, distance and other conditions.

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Posted by waqqas1

Please refer this link also
http://en.wikipedia.org/wiki/Radio_propagation_model

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Posted by akumar_8181

A Radio Propagation Model, also known as the Radio Wave Propagation Model or the Radio Frequency Propagation Model, is an empirical mathematical formulation for the characterization of radio wave propagation as a function of frequency, distance and other conditions. A single model is usually developed to predict the behavior of propagation for all similar links under similar constraints. Created with the goal of formalizing the way radio waves are propagated from one place to another, such models typically predict the path loss along a link or the effective coverage area of a transmitter.

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Posted by sagitraz